Adjustable isolation sleeve assembly for well stimulation through production tubing

摘要

A fracturing system includes a fracturing spool that mounts onto a wellhead assembly for injecting fracturing fluid into a well beneath the wellhead assembly. An isolation sleeve is included with the fracturing system that couples to the fracturing spool and extends into the wellhead to isolate and protect portions of the wellhead assembly from the fracturing fluid. A seal is between the isolation sleeve and bore of the wellhead assembly, which is threaded to the isolation sleeve. Manipulating the threaded connection between the isolation sleeve and seal selectively positions the isolation sleeve to designated axial positions within the wellhead assembly.

主权项

1. A fracturing assembly for use with a wellhead assembly comprising:
a fracturing spool that is selectively mounted onto the wellhead assembly; a seal assembly axially supported in an axial bore in the fracturing spool; and an isolation sleeve comprising an end in selective communication with a supply of fracturing fluid, a portion that extends into a main bore of the wellhead assembly and defines a barrier between the fracturing fluid and components in the wellhead assembly, and an outer surface with a threaded portion that engages threads on an inner surface of a load ring of the seal assembly, the load ring supporting the isolation sleeve within the wellhead assembly and the threaded portion having a length so that the isolation sleeve is adjustable to axial locations within the main bore by a rotation of the isolation sleeve relative to the load ring.